-91.73% is the change from 980 to 81
Calculation steps:
[( 81 - 980 ) ÷ 980] x 100 = -91.73%
Formula
Percentage change = [(81 - 980) / 980] x 100
Subtract the new number by the original number
81 - 980 = -899
-899 ÷ 980 = -0.9173469387755102
-0.9173469387755102 x 100 = -91.73%